Watch the video:
Timestamps:
0:00 - Explanation
0:39 - Restart Steam
1:22 - Restarting PC
1:32 - Reset Windows Proxy settings
1:48 - Check Disk isn't in use
2:30 - Flush DNS Cache & Steam download cache
Can’t download game updates as it’s stuck at 0 bytes? This video shows you everything you need to know to solve that issue. By the end, you should be able to use Steam normally.